it is an interesting balance, as i mention, president clinton doing the stumping, hillary clinton doing a foreign policy event, she is down in florida today. these are not midterm stumping events. they've found a division of labor within the family for now. dnc chair debbie wasserman shultz, thanks for your time today. >> thanks, ari. >>> coming up, two years ago tonight, a story we all remember, trayvon martin was shot and killed. a tragedy that sparked a national conversation. we're going to talk about that case and the implications that continue to shape a lot of policy discussions. >>> but first, before we get to that, we have here today an exclusive one-on-one interview with one of the most influential environmentalists in the republican party, christine todd whitman about what she calls the defining environmental challenge of our time. that's after the break. your eyes really are unique. in fact, they depend on a unique set of nutrients. [ male announcer ] that's why there's ocuvite to help protect your eye health. as you age, your eyes can lose vital nutrients. ocuvite helps repl